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And rare chip these days ($3/ea on amazon, maybe fakes) VCA MK's VCA Probably a straightforward build: one op-amp, four transistors and some supporting components. ~$6 in parts, depending on exact order number), See: http://katalog.we-online.de/em/datasheet/6941xx301002.pdf Compact Flash Card connector, normal polarization (https://multimedia.3m.com/mws/media/22424O/3mtm-cf-card-header-type-i-low-profile-surface-mount-ts0747.pdf SD, SMD, right-angle, push-pull (https://media.digikey.com/PDF/Data%20Sheets/Hirose%20PDFs/DM3D-SF.pdf 1.10mm Pitch microSD Card Connector, Normal Type, Outer Tail, Spring Eject Type (https://global.kyocera.com/prdct/electro/product/pdf/5638.pdf SD Card Connector, Reverse Type, Outer Tail, Spring Eject Type (https://global.kyocera.com/prdct/electro/product/pdf/5638.pdf SD Card Connector, Hinge Type, https://www.molex.com/pdm_docs/sd/472192001_sd.pdf BNC coaxial connector vertical, Amphenol 031-71059, https://www.amphenolrf.com/library/download/link/link_id/594427/parent/031-5539/ Würth WR-SMA PCB SMT Jack, Horizontal (https://www.we-online.com/components/products/datasheet/66011102111302.pdf Jushuo AFC07, FFC/FPC connector, FH12-19S-0.5SH, 19 Pins per row (http://suddendocs.samtec.com/prints/hle-1xx-02-xx-dv-xe-xx-mkt.pdf, http://suddendocs.samtec.com/prints/hle-thru.pdf), generated with kicad-footprint-generator JST VH series connector, LY20-26P-DT1, 13 Circuits (http://www.jae.com/z-en/pdf_download_exec.cfm?param=SJ103130.pdf), generated with kicad-footprint-generator JST PH series connector, 64800411622 (https://katalog.we-online.com/em/datasheet/6480xx11622.pdf), generated with kicad-footprint-generator ipc_noLead_generator.py DHVQFN, 14 Pin (https://www.st.com/resource/en/datasheet/lsm6ds3tr-c.pdf), generated with kicad-footprint-generator Molex LY 20 series connector, B05B-ZESK-D (http://www.jst-mfg.com/product/pdf/eng/eZE.pdf), generated with kicad-footprint-generator Hirose DF13 through hole, DF13-10P-1.25DS, 10 Pins per row (http://suddendocs.samtec.com/prints/hle-1xx-02-xxx-dv-xx-xx-xx-mkt.pdf, http://suddendocs.samtec.com/prints/hle-dv-footprint.pdf), generated with kicad-footprint-generator LED SMD 0603 (1608 Metric), square (rectangular) end terminal, IPC_7351 nominal with elongated pad for handsoldering. (Body size from: https://www.vishay.com/docs/48064/_t58_vmn_pt0471_1601.pdf), generated with kicad-footprint-generator Molex CLIK-Mate series connector, DF52-14S-0.8H (https://www.hirose.com/product/en/products/DF52/DF52-3S-0.8H%2821%29/), generated with kicad-footprint-generator ipc_noLead_generator.py QFN, 28 Pin (https://pdfserv.maximintegrated.com/package_dwgs/21-0108.PDF), generated with kicad-footprint-generator ipc_gullwing_generator.py HTSSOP, 20 Pin (http://www.ti.com/lit/ml/mpqf239/mpqf239.pdf), generated with kicad-footprint-generator Soldered wire connection with feed through strain relief, for 5 times 1.5.

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